Glass-pressing machine



F. w"; STEWART.

GLASS PRESSING MACHINE.

APPLICATION FILED OCT. 27, I915.

' 1,343,987. f Patented June 22,1920.

2 SHEETSSHEE\T 1.

HIIIHI III III! II!!! WITNESSES @Qf/M F. W. STEWART.

GLASS PRESSING MACHINE.

APPLICATION FILED OCT. 27, 1915.

Patented June 22, 1920.

2 SHEETS-SHEET 2.

OFFICE.

FREDERICK W. STEWART, OF BEAVER, PENNSY LVANLA' GLASS-PRESSING MACHINE.

Application filed dctober 27, 1915. Serial No. 58.221.-

To all uihom it may concern:

Be it known that I, FREDERICK W. STEW- ART, a citizen of the UnitedStates, and resi- -dent of Beaver, in the county of Beaver and State ofPennsylvania, have invented a new and useful Improvement in 'Glass-Pressing Machines; and I do hereby declare the following to be a full,clear, and exact description thereof. I

My invention relates to machines forpressing glass blanks preparatory toblowing, or for forming the finished article by pressing where desired.

The object of my invention is to provide for the automatic control ofthe press-head,

I raised position until the difficulty has been corrected. In theaccompanying drawings, Figure 1 is a side elevation ofmy improvedmachine;

Fig. 2 is a plan view of the mold-table and the automatically operatedvalve; Fig. 3 is a section on the line 3-3, Fig.1; Fig. 4 is a view ofthe pipe connections; Fig. 5 is a sectional view of the triple valve;and Fig. 6 is a section on the line 6-6, Fig. 4,.

Referring-to the drawings, the numeral 2 designates a suitable rframe orcarriage mounted on wheels 3 for convenience in transporting the devicefrom one part of the factory to another. I

A motor 4 is mounted on the carriage. A pinion 5 on the motor-shaftmeshes with the gear-wheel 6 on .the counter-shaft 7 mounted in bearings8. A worm 9 on the countershaft 7 meshes with the worm-wheel 10 on A thevertical shaft 11 stepped in bearings 12.

Mounted on the shaft 11 is the arm 13 provided at its outer end with thestud 14. Above the arm 13 on the shaft 11 is the disk 15 which is cutaway as at 16. The disk 15 carries the cam 17, which may be securedthereto in any suitable manner. This cam is made up of two plates 17and-17", the

one slidable with reference to the other. The inner plate 17 has theslot 17, and a bolt on plate 17 engages said slot to secure the platesrigidly to ether.

A rotary mold-tab e 18 is mounted on the sleeve 19 on the shaft 20. Onthe sleeve 19 is the star-wheel 21 with the slots 22. This star-wheelwith the arm 13 forms what is commonly known as the Geneva movement.

The molds 23 are mounted on the table 18, and said molds support thepartible neck-rings 24.

A cylinder 25 has the sleeves 26, which engage the columns 20 and 27,and said cyllnder is adjustable by means of the nuts 28 engaging thethreaded portions 29 of said columns. The cylinder 25 contains anordinary piston connected up to the piston-rod 30, which carries theplunger-frame 31 of ordinar construction. At the lower end of the punger-frame 31 is the plunger 32.

The pipes 33 and 34 lead to the upper and lower ends respectively of thecylinder 25. These pipes have the flexible sections 35, which connectthe pipes 33 and 34 with the pipes 36 and 37. Pipes 36 and 37 areconnected up to the triple-valve 38. The

supply-pipe 39 is connected up to the valve 38.

The handle 40 of the valve projects into the path of the cam 17 .so asto be engaged thereby as the disk 15 rotates. Springs 41 and 42 areconnected to stationary members 43 and 44 respectively, and the oppositeends of said springs are connected to the opposite ends of the arm 45,and act to throw the handle 40 back to the normal position and admitair'to the lower end of the cylind'er 25 to lift the after set forth.

Located in the supply-pipe 39 and in the pipe 37 are the valves 46' and47 respectively. A common lever 48 is connected to said valves so thatthey may be operated simultaneously for the purpose fully hereinafterset forth.

Mounted on the shaft 7 is the brake-wheel 49. A'foot-lever 50 isfulcrumed at 51 in suitable bearings, the outer end of said lever havingthe curved portion 52, whi-h is adapted to engage and conform to theperiphery of the brake-wheel 49. The spring 53 is interposed between theouter end of the lever 50 and the support 54, said spring tending tolift the outer end of said lever and release the brake-shoe 52. A chain55 is connected to the lever 50 and to a suitable switch 56. Byoperating the lever 50, the brake-shoe 52 is applied to the brakewheel49, in case of an emergency, to stop plunger as fully hereinthe machineand, at the same time, the switch Specification of Letters Patent.Patented J n 22, 192() 56v operates to cut off the current to the motor.

' In the operation of the machine, the glass for making the blank orarticle to be pressed is gathered in the ordinaryman ner, and depositedinto one of the molds 23. The mold then moves around in position underthe plunger 32 by the intermittent action of the'Geneva movement. Theoperation of the disk 15 is .so timed that when the mold has beenbrought into proper position under the plunger, the arm of v the exhaustwhile the air pressure is admitted to the pipe 36 and passes thence tothe upper 'end of the cylinder 25. The plunger 32 is accordingly loweredinto the mold and the time that the plunger is permitted to remain incontact with the glass is controlled by the size of the cam 17 or thelength of time the arm-40 of the valve remains-in contact therewith.This will depend upon the size of the article being pressed and theamount of glass used therein. In this manner the dwell of the plunger isaccurately controlled. The cam 17 is provided with the receding portion17' which acts to gradually reverse the arm 4.0 or gradually close theports communicating with the pipe 36,Qbut when'the han-. dle 40 of thevalve is released from the cam, the springs 41 and 42 complete themovement of the valve, so as to again connect the supply-pipe upwith-the pipe 37 leading to the lowerend of the cylinder 25 to lift theplunger. The Geneva movement is so timed that upon the lifting of theplunger the stud 14 enters one of the slots 22 of the star-wheel 21 andthe table 18 is moved around into position the plunger into the moldwhen itcomes around into position, such as failure of the glass to beproperly. deposited in the mold or the condition of the glass is bad,the operator by moving the handle 48 cuts oil" the supply of motivefluid and by the operation' of the valve 47 simultaneously therewithtraps the motive fluid in the lower end of 'the cylinder 25 and so holdsthe plunger in its raised position. This does not interfere with themovement of the parts,'as the cam 17 although engaging the handle 40,and moving the same will have no effect to admit fluid to the upper endof the cylinder or release the fluid from the lower end thereof, so thatwhile the plunger does not descend, the machine can continue to operateas before.

By the use of the emergency lever 50, the operator places his foot uponthe treadle, throws the brake-shoe 52 into engagement with; thebrake-wheel 49, and stops the operation of the machine at once, while atthe same time, the chain 55 operates the switch 56 and 'shuts off thecurrent to the motor. The arm 57 is employed for returning the switch toits closed position when the treadle has been raised by the spring 53and it is desired to start the motor.

' What I claim is:

1. In a glass pressing machine, the combination of a rotary table, meansfor intermittently rotating same, a mold on said table, a plunger, afluid-operated cylinder for said plunger, a valve controlling motivefluid to said cylinder, fluid-supply connections leading to the upperand lower'ends of said cylinder, a rotary-member, a cam on saidrotary-member, an arm on said valve in the path of the movement of saidcam, and means independent of said valve for cutting off the supply ofmotive fluid to said cylinder and at the same time trapping the-fluid inthe lower end thereof.

2. In a glass pressing machine, the combination of a rotary table, meansfor intermittently rotating same, a mold on said table, a plunger, afiuidoperated cylinder for said plunger, a valve controlling motivefluid to said cylinder, fluid-supply connections leading to the upperand lower ends of said cylinder, a rotary-member, a cam on saidrotary-member, an arm on said valve in the path of the movement of saidcam, a valve in the supply connection, a valve in the connection leadingto the lower end of said cylinder, and means for closing the last twosaid valves simultaneously whereby the motive fluid is trapped in thelower end of said cylinder.

In testimony whereof, I, the said FRED- ERICK W. STEWART, have hereuntoset my

